Coercivity of sintered Nd(Fe0.92-xGaxB0.08)5.5 permanent magnets

被引:8
作者
Kou, XC
de Boer, FR
Kronmüller, H
机构
[1] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands
[2] Max Planck Inst Met Forsch, Inst Phys, D-70569 Stuttgart, Germany
关键词
D O I
10.1063/1.367525
中图分类号
O59 [应用物理学];
学科分类号
摘要
The temperature dependence of the coercive field of Nd( Fe0.92-xGaxB0.08)(5.5) compounds with x = 0 and 0.01 has been measured from 10 K up to the Curie temperatures in fields applied parallel or perpendicular to the magnetic alignment direction and has been analyzed in terms of a micromagnetic model. Two temperature ranges in which different mechanisms control the coercivity can clearly be distinguished. At temperatures above 170 K, a nucleation process of reversed domains determines the coercivity mechanism. From the micromagnetism point of view, partial substitution of Fe by Ga into NdFeB magnets leads to a reduction of the local effective demagnetization field (-NeffMs) which makes the nucleation of reversed domains more difficult, and therefore enhances the coercivity. (C) 1998 American Institute of Physics. [S0021-8979(98)15311-2].
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页码:6408 / 6410
页数:3
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